At the crest of the hill they could see across a flat valley in the direction of Chew Road. Something seemed to be burning behind the next rise; a ruddy glare lit the clouds. Down the line guns began to growl again, and the earth trembled gently with the sound of an explosion somewhere in the rear. Murray Lee, sitting alone at the controls of his tank. So this was war! There were trees along their ridge, and looking through the side peep-hole of his tank Murray could make out the vague forms of a line of whippets among them, waiting, like themselves, for the order to advance. He wondered what the enemy were like; evidently not all dodos, since so many tanks had been pushed up to the front. This argued a man or animal that ran along the ground. The dodos seemed to spend most of their time in the air.... He was recalled from his meditations by the ringing of the attention bell and the radiophone began to speak rapidly: "American tank division--enemy tanks reported approaching. Detain them as long as possible and then retire. Your machines are not to be sacrificed; Radio your positions with reference to Clark Creek as you retire for guidance of artillery registering on enemy tanks. There--" The voice broke off in mid-sentence. So the dodos had tanks! Murray Lee snapped in his controls and glanced forward. Surely in the gloom along that distant ridge there was a darker spot--next to the house--something. Suddenly, with a roar like a thousand thunders, a bolt of sheer light seemed to leap from the dark shape on the opposite hill, straight toward the trees where Murray had noticed the whippets. He saw one of the trees leap into vivid flame from root to branch as the beam struck it; saw a whippet, sharply outlined in the fierce glow, its front armor-plate caving; then its ammunition blew up in a shower of sparks, and he was frantically busy with his own controls and gun. CHAPTER X Hopelessness All along the line of the American tanks the guns flamed; flame-streaked fountains of dirt leaped up around the dark shape on the opposite hill and a burst of fire came from the farmhouse beside it as a misdirected shell struck it somewhere.